The nose and the sense of scent did not take part in the first sin of Adam and Eve. The nose is the aspect of Zeir Anpin. It is where the life force entered the body for the first time (Genesis 2:7). A born baby makes a sound from his lungs when his nose is opened for the first time to receive his life force from the Creator through his nostrils.
Because the nose is the aspect of Zeir Anpin, those who are spiritually elevated can ‘smell’ according to the level they reached. Many times we connect the sense of smell to events in this world. Frequently, we hear people say “this deal/person doesn’t smell good”.
The child was spiritually elevated and he could sense the spiritual garments of his guests.
The prayer of the Shema Israel unifies our soul with the Light of the Creator. It’s a process that we need to repeat every morning after going through the death aspect we experienced during sleep. It is important to do the Shema prayer during the first three hours of the morning to establish our soul connection in the frame of Chessed. Some synagogues start their Shabbat morning prayer after the the third hour of the morning and it’s not good. Those who know the full spiritual aspect of the Shema prayer, do it earlier at home before going to the prayer in a Minyan.

The Holy Ari was known to be able to know a person’s spiritual level by his sense of smell.
God loves the good scent from the sacrifices that were brought in the Holy Temple and above all was the ‘Ketoret’ (11 incense).
Deuteronomy 33:10
“יוֹרוּ מִשְׁפָּטֶיךָ לְיַעֲקֹב, וְתוֹרָתְךָ לְיִשְׂרָאֵל; יָשִׂימוּ קְטוֹרָה בְּאַפֶּךָ, וְכָלִיל עַל-מִזְבְּחֶךָ”
“They shall teach Your ordinances to Jacob, And Your Torah to Israel. They shall put incense before You, And whole burnt offerings on Your altar.“

Isaiah 11:3
“וַהֲרִיחוֹ, בְּיִרְאַת יְהוָה; וְלֹא-לְמַרְאֵה עֵינָיו יִשְׁפּוֹט, וְלֹא-לְמִשְׁמַע אָזְנָיו יוֹכִיחַ”
“And He will smell with the awe of YHVH, And He will not judge by what His eyes see, Nor make a decision by what His ears hear;”

When Mashiach is revealed in the world he will recognize the pure people by their scent. When he comes the world will not be fully corrected and he will use the sense of scent that is the only channel that doesn’t need correction. He will not check ID, or membership to a specific group or even religion. If a person has a pure heart then he will have the protection of Mashiach.

Those who think that they are pure in heart and do good for other people are in most cases very wrong.
To have the desired level of purity one should connect to the scent of the Torah and all the important prayers to purify his soul and actions and remove all aspects of the desire for the self alone. Without the Torah and Zohar as its higher level connection tool, one can not reach the higher level of purity and have the desired scent.